A unique idea which was considered in special theory of relativity was

  1. The time-period of any event in every frame of refrance will be the same
  2. Speed of light will be constant for all frames of reference 
  3. For observers, all laws related to physical phenomenon are different in different inertial reference frames
  4. A particle or an entity of a certain mass can travel at a speed that is greater than the speed of light in a vacuum.

Answer (Detailed Solution Below)

Option 2 : Speed of light will be constant for all frames of reference 
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CONCEPT:

  • In the special theory of relativity, there are few unique ideas that completely change our understanding of physics. A few of the postulates or rules are as follows.
  • According to the Theory of Special Relativity:
  1. The Laws of physics remain the same for all observers who are non-accelerating (i.e. not in motion).
  2. The speed of light in the vacuum is completely independent of the observer's motion.
  3. No particle which carries energy and has a mass that can travel at the speed of light.
  4. And the most amazing idea is that perception of time will change in every frame of reference.

EXPLANATION:

  • There are many unique ideas in the special theory of relativity.
  • The one about the speed of light is
    • The speed of light in the vacuum is completely independent of the observer's motion.
    • It means the speed of light will always be constant for all frames of reference.
  • So, the correct answer will be option 2.
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